Synchronous motor variable frequency starting AC excitation system

The MWAE series variable frequency starting AC excitation system can be used in conjunction with the MGX synchronous motor rotating rectifier disc (high-speed type) produced by our company.

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Detail

1、 System Overview

The MWAE type variable frequency starting AC excitation system is a brushless synchronous motor excitation system developed by our company in 2012 that can adapt to variable frequency starting. The core control unit is developed on the EC-5000 excitation regulator software and hardware technology platform, which can meet various on-site operation requirements such as variable frequency starting and variable frequency operation or variable frequency starting and power frequency operation.

2、 Application scope

It can be widely used in large-scale high-speed or ultra high speed brushless synchronous motor units that require variable frequency starting in industrial and mining enterprises such as oil and gas pipeline long-distance compressors, LNG compressors, metallurgical blast furnace fans, sintering fans, pulp mills, etc.

3、 Product Features

Fully digitized

From the AC sampling of input channels to the output of control pulses, all are digitized, with a graphical human-machine interface (touch screen) and complete functions for testing, manual operation, and automatic fault recording and analysis.

Main control unit

We use our company's latest EC-5000 excitation regulator, which is powered by a 32-bit digital signal processor (DSP) from TI in the United States, with a maximum speed of up to 150MHz.

The hardware adopts surface mount technology and a four layer printed circuit board. The chips are all mature products from well-known domestic and foreign enterprises.

The software is programmed using C language or ladder diagram (PLD), instruction list (IL), Basic, structured text (ST), sequential function diagram (SFC), data module editor, data type editor, etc.

Dual regulator (optional)

Equipped with dual sets of excitation regulators, the two sets are completely independent and have 100% software and hardware redundancy. When the fault level of the main excitation regulator is worse than that of the backup excitation regulator, it will automatically switch to the backup excitation regulator without shaking.

HMI

Adopting a 7-inch (built-in) or 10 inch industrial grade touch screen, a larger size touch screen (optional) can also be selected, with a resolution of 800 * 600 or 1024 * 768. The operation interface supports the selection of Chinese and English.

Rectifying unit

Adopting dual sets of three-phase IGBT inverter chopper voltage regulation units, with three-phase filtering circuits added. Dual power units are operated with primary and backup machines, with 100% redundancy.

Exciter transformer

When the excitation voltage of the exciter matches the AC 400V system of the mains power, an excitation transformer can be omitted. If a transformer is required, the standard configuration is a B-class dry-type rectifier transformer, or an F-class dry-type rectifier transformer can be optionally selected.

Dual power supply

Adopting dual power supply of AC 220VAC and DC 220VDC, the two power supplies operate in parallel and are mutually redundant.

Start mode

Support synchronous starting controlled by high-voltage frequency converter.

Adjustment method

Manual (constant excitation voltage, constant excitation current, constant main motor excitation current regulation), automatic (constant power factor or constant reactive power regulation), frequency converter control tracking mode (automatic mode during frequency conversion operation), manual and automatic, and different automatic modes can be switched between each other (except for frequency converter control tracking mode), with no shaking during switching.

Limitations and Protection

It has inverse time limit strong excitation limitation, minimum excitation limitation, excitation stator overvoltage limitation, excitation power supply power-off protection, excitation stator grounding protection, rotating diode short circuit monitoring and protection, low voltage strong excitation, out of step protection, excitation limitation, regulation failure protection, comprehensive software and hardware detection and protection.

Power frequency frequency conversion switching

It has automatic adjustment functions such as power frequency, frequency conversion switching adaptation, and power factor during power frequency operation, and is suitable for on-site operation requirements such as frequency conversion start-up and frequency conversion start-up.

Communication interface

Provide open communication interfaces with standard RS485-RTU or fieldbus CANBUS for on-site communication, facilitating connection with other devices.

Wave recording and oscilloscope

Can record all analog data and switch status for 20 seconds before and 80 seconds after the fault. It can be uploaded to the upper computer through the serial port for display, processing, waveform storage, analysis, and printing. It can display real-time waveforms of various physical quantities during operation, covering all analog quantities. It can display communication values, effective values, and operating switch status, and can set the sampling resolution and display resolution for each cycle, as well as the time period and range.

Event Memories

It is able to record 1000 faults, event action values and fault times (accurate to seconds) according to the first in, first out principle, and record the current operating parameter values, covering basically all analog quantities.

Anti-interference ability

· Anti static discharge interference:Complies with GB/T14598.14; Test level 3, test voltage ± 6kV.

· Attenuation oscillation wave pulse group interference：Complies with GB/T14598.13; Test level 3, with frequencies of 1MHz and 100kHz respectively. The common mode is 2.5kV and the differential mode is 1.0kV.

· Fast transient pulse group interference：Compliant with GB/T14598.10; Test level 3, positive and negative polarity peak pulses, frequency 5KHz, common mode 2.0kV.

· Radiated electromagnetic field interference：Complies with GB/T14598.9; Test level 3, conducted in a shielded room with a field strength of 10V/m and a scanning speed of 1.5 × 10-3 times per second, with one test in both horizontal and vertical directions.

Cabinet size and protection level